I started working on that tutorial map again, and I noticed that the filter_activator_team entity isn't in the FGD. I suggest that Solokiller should do his thing and add it. Also, feel free to use this thread to post other things that should be in the FGD and are not.
http://files.empiresleague.com/Mapping/Empires_FGD_for_Hammer.zip I made this FGD a few months ago, it should have all the entities available in Empires. As i said in the original thread, i don't have access to the source code, so i don't know ALL the entities avilable.